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參數(shù)資料
| 型號： | LTC1562AIG#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 14/28頁 |
| 文件大小： | 0K |
| 描述： | IC FILTER UNIV RC QUAD LN 20SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,800 |
| 濾波器類型： | 通用連續(xù)計時 |
| 頻率 - 截止或中心： | 150kHz |
| 濾波器數(shù)： | 4 |
| 濾波器階數(shù)： | 8th |
| 電源電壓： | 4.75 V ~ 10.5 V，±4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SSOP |
| 包裝： | 帶卷 (TR) |
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21
LTC1562
1562fa
APPLICATIONS INFORMATION
WU
U
Note that the depth of the notch depends on the accuracy
of this resistor ratioing. The virtual-ground summing
point in Figure 11 may be from an op amp as shown, or in
a practical cascaded filter, the INV input of another Opera-
tional Filter block. The transfer function in Figure 11 with
CIN1 = 0 is a “pure” notch (fN = f0) of the HBR(s) form above,
and the parameters are:
=
=
NO
N
GAIN
FF
H
R
R 2
Because fN = f0 in this case, the gain magnitude both at DC
and at high frequencies (f >> fN) is the same, HN (assuming
that the op amp in Figure 11 adds no significant frequency
response). Figure 12 shows this. Such a notch is ineffi-
cient as a cascaded part of a highpass, lowpass or band-
pass filter (the most common uses for notches). Varia-
tions of Figure 11 can add a highpass or lowpass shape to
the notch, without using more Operational Filter blocks.
The key to doing so is to decouple the notch frequency fN
from the center frequency f0 of the Operational Filter block
(this is shown in Figures 13 and 15). The next two sections
summarize two variations of Figure 11 with this highpass/
lowpass shaping, and the remaining section shows a
different approach to building notches.
Feedforward Notches for fN > f0
When CIN1 ≠ 0 in Figure 11, the notch frequency fN is above
the center frequency f0 and the response has a lowpass
shape as well as a notch (Figure 13). CIN1 contributes
phase lead, which increases the notch frequency above
the center frequency of the 2nd order Operational Filter
block. The resistor constraint from the previous section
also applies here and the HBR(s) parameters become:
=
NO
IN
Q
N
GAIN
FF
O
N
RC
H
R
1
11
1
2
–
C is the internal capacitor value in the Operational Filter
block (in the LTC1562, 159pF).
The configuration of Figure 11 is most useful for a
stopband notch in a lowpass filter or as an upper stopband
notch in a bandpass filter, since the two resistors RIN2 and
RFF2 can replace the input resistor RIN of either a lowpass
section (Figure 5) or a resistor-input bandpass section
(Figure 6a) built from a second Operational Filter block.
Figure 12. Notch Response with fN = fO
FREQUENCY (kHz)
10
–60
GAIN
(dB)
–40
–20
20
100
1000
1562 F13
0
fO = 100kHz
fN = 200kHz
Q = 1
DC GAIN = 0dB
fN
2
fO
2
DC GAIN = HN
()
HIGH FREQ
GAIN = HN
FREQUENCY (kHz)
10
–100
GAIN
(dB)
–40
–20
0
100
1000
AN54 TA18
–60
–80
fN = fO = 100kHz
HN = 1
Q = 1
Figure 13. Notch Response with fN > fO
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| LTC1562CG#PBF | 功能描述:IC FILTER UNIV RC QUAD LN 20SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
| LTC1562CG#TR | 功能描述:IC FILTER UNIV RC QUAD LN 20SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 濾波器 - 有源 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 濾波器類型:連續(xù)時間，帶通低通 頻率 - 截止或中心:150kHz 濾波器數(shù):4 濾波器階數(shù):8th 電源電壓:4.74 V ~ 11 V，±2.37 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) |
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